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مقاله پژوهشی: بررسی پارامترهای موثر در طیف هماهنگ مراتب بالا از ساختار دی‌سلنید تنگستن | ||
| فیزیک کاربردی ایران | ||
| دوره 13، شماره 3 - شماره پیاپی 34، مهر 1402، صفحه 25-47 اصل مقاله (2.62 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22051/ijap.2023.42315.1306 | ||
| نویسندگان | ||
| راضیه فقیه لطیف1؛ امین صادقی فراز2؛ محمد منفرد3؛ الناز ایرانی* 4 | ||
| 1دانشجوی کارشناسی ارشد، دانشکده علوم پایه، گروه فیزیک اتمی مولکولی، دانشگاه تربیت مدرس، تهران، ایران | ||
| 2دانشجوی دکترا، دانشکده علوم پایه، گروه فیزیک اتمی مولکولی، دانشگاه تربیت مدرس، تهران، ایران | ||
| 3پژوهشگر، انستیتو نظریه ماده چگال و اپتیک، دانشگاه فردریچ-شیلر ینا، ینا، آلمان | ||
| 4استادیار، دانشکده علوم پایه، گروه فیزیک اتمی مولکولی، دانشگاه تربیت مدرس، تهران، ایران | ||
| چکیده | ||
| در این پژوهش تقارن هماهنگهای مرتبه بالای منتج از برهمکنش تک لایه دی سلنید تنگستن با نور قطبیده خطی در دو راستای زیگزاگ و آرمیچر با نظریه تابعی چگالی وابسته زمانی در فضای حقیقی بررسی شده است. وابستگی رفتار فرکانس قطع با افزایش دامنه میدان الکتریکی و رفتار بازده هماهنگ با طول موج بررسی و تحلیل شده است. نتایج بدست آمده وابستگی خطی فرکانس قطع با میدان الکتریکی و رفتار نمایی بازده هماهنگ به طول موج لیزر را نشان میدهد. همچنین اثر قطبش میدان لیزر ورودی بر طیف هماهنگهای مرتبه بالا و بازده آنها بررسی شده است. در واقع با استفاده از تپ لیزر قطبیده بیضوی با پارامتر الیپتیسیته 1/0 به نحوی که قطر اصلی آن در راستای آرمیچر باشد بیشترین بازدهی حاصل میشود. افزون بر این، نتایج این پژوهش نشان میدهد که با تغییر قطبش میدان الکتریکی ورودی قطبش هماهنگهای مرتبه بالا نیز تغییر میکند که منجر به تولید هماهنگهای مرتبه بالا با قطبشهای مختلف میشود. | ||
| کلیدواژه‌ها | ||
| هماهنگ مراتب بالا؛ نیمه‌هادی دی‌سلناید تنگستن؛ بازده هماهنگ؛ قطبش بیضوی؛ نظریه تابعی چگالی وابسته به زمان | ||
| عنوان مقاله [English] | ||
| Research Paper: Investigating Effective Parameters in the High-Harmonic Spectra from WSe2 Structure | ||
| نویسندگان [English] | ||
| Razieh Faghihlatif1؛ Amin Sadeghifaraz2؛ Mohammad Monfared3؛ Elnaz Irani4 | ||
| 1M. Sc. Student, Department of Physics, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran. | ||
| 2PhD Student, Department of Physics, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran. | ||
| 3Researcher, Institute of Condensed Matter Theory and Optics, Friedrich-Schiller-University Jena, Max-Wien-Platz 1, Jena D-07743, Germany | ||
| 4Assistant Professor, Department of Physics, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran | ||
| چکیده [English] | ||
| In this research, the symmetry of high-order harmonics resulting from the interaction of a single-layer WSe2 with a linearly polarized laser in both zigzag and armchair directions have been investigated using time-dependent density functional theory in real space. The dependence of the cutoff frequency behavior with the increase of the electric field amplitude and the behavior of the harmonic yield with the laser wavelength has been analyzed. The results show the linear dependence of the cutoff frequency with the electric field and the exponential behavior of the harmonic yield with the laser wavelength. Also, the effect of the input laser field polarization on the high-order harmonic spectrum and harmonic yield has been investigated. Changing the rotation angle of laser polarization to 30 degrees for elliptically polarized light with an ellipticity parameter of 0.1 creates the highest harmonic yield. Also, the results of this research show that by changing the polarization of the input electric field, the polarization of high-order harmonics also changes, which leads to the production of high-order harmonics with different polarization. | ||
| کلیدواژه‌ها [English] | ||
| High-order Harmonics, WSe2 Semiconductor, Harmonic Yield, Elliptically Polarized, Time-dependent Density Functional Theory | ||
| مراجع | ||
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